Careful - many televisions in NTSC land do not handle 50Hz (PAL). While you can force games/demos to run in NTSC, in many cases it screws the timing.
Getting an Indivision somewhat solves the problem. Most CRTs can handle 50Hz OK, and the Indivision can "upsample" the signal to over 60Hz, making it compatible with LCDs (which often don't accept 50Hz). However, running the scanrate at anything other than 50Hz (or an exact multiple) will affect scrolling, more noticeable with some things than others.
If you're really fussy, the very slightly higher oscillator frequency of NTSC machines also makes a noticeable difference, even when in "PAL mode".
Best option will depend on how particular you are. Personally, I prefer PAL machines, and use LCDs and CRTs at 50Hz.
